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Cross-linking type aqueous binder for lithium ion battery and electrode prepared from cross-linking type aqueous binder

A technology of lithium-ion batteries and binders, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of silicon-based negative electrode cycle irreversible capacity increase, shedding, etc., to achieve uniformity of dispersion, maintain stability, The effect of good adhesion

Inactive Publication Date: 2020-05-05
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these binder molecules are in the form of straight chains, and when used alone as a binder, they are still easy to fall off from the surface of silicon particles, resulting in an increase in the irreversible capacity of the silicon-based negative electrode at the end of the cycle.

Method used

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  • Cross-linking type aqueous binder for lithium ion battery and electrode prepared from cross-linking type aqueous binder
  • Cross-linking type aqueous binder for lithium ion battery and electrode prepared from cross-linking type aqueous binder
  • Cross-linking type aqueous binder for lithium ion battery and electrode prepared from cross-linking type aqueous binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Electrode preparation: Sodium carboxymethylcellulose (CMC) and cationic polyacrylamide (CPAM) were prepared into 2% aqueous solutions respectively. Take 0.45g of spherical nano-silicon particles with a particle size distribution of 50-150nm and 0.15g of conductive carbon black (super-P) into 3.75g of sodium carboxymethyl cellulose aqueous solution and mix well, then add 3.75g of cationic The polyacrylamide aqueous solution is mixed evenly with the above slurry. The prepared slurry is evenly coated on the copper foil current collector, and the loading amount of the active material nano-silicon is controlled at 1 mg / cm 2 About; air-dry the pole piece obtained above at room temperature, then cut the pole piece into a disc with a diameter of 14mm, and compact it with a roller press, and the compaction density is controlled at 0.8g / cm 3 . Active material in the obtained electrode: conductive agent: binder = 60:20:20.

[0032]The electrode prepared above was vacuum-dried a...

Embodiment 2

[0035] Electrode preparation: Sodium alginate (Alg) and cationic polyacrylamide (CPAM) were prepared into 2% aqueous solutions respectively. Take 0.45g of lamellar nano-silicon particles with a diameter of 100-150nm and a thickness of 30nm, and 0.15g of conductive carbon black (super-P) into 5g of sodium alginate aqueous solution and mix well, then add 2.5g of cations The polyacrylamide aqueous solution is mixed evenly with the above slurry. The prepared slurry is evenly coated on the copper foil current collector, and the loading amount of the active material nano-silicon is controlled at 1 mg / cm 2 About; air-dry the pole piece obtained above at room temperature, then cut the pole piece into a disc with a diameter of 14mm, and compact it with a roller press, and the compaction density is controlled at 0.8g / cm 3 . Active material in the obtained electrode: conductive agent: binder = 60:20:20.

[0036] The electrode prepared above was vacuum-dried at 100° C. for 12 h to remo...

Embodiment 3

[0039] Electrode preparation: Lithium polyacrylate (PAALi) and cationic polyacrylamide (CPAM) were prepared into 2% aqueous solutions respectively. Take 0.45g of silicon nanowires with a length of 1-2μm and a diameter of 60-150nm and 0.15g of conductive carbon black (super-P) into 4.5g of an aqueous solution of lithium polyacrylate and mix well, then add 3g of cationic polyacrylate The acrylamide aqueous solution is uniformly mixed with the above slurry. The prepared slurry is evenly coated on the copper foil current collector, and the loading amount of the active material nano-silicon is controlled at 1 mg / cm 2 About; air-dry the pole piece obtained above at room temperature, then cut the pole piece into a disc with a diameter of 14mm, and compact it with a roller press, and the compaction density is controlled at 0.8g / cm 3 . Active material in the obtained electrode: conductive agent: binder = 60:20:20.

[0040] The electrode prepared above was vacuum-dried at 100° C. for...

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Abstract

The invention relates to an in-situ cross-linked polymer binder for a lithium ion battery, an electrode containing the polymer binder and a preparation method of the electrode. The polymer binder hasa three-dimensional network structure, and is formed by in-situ polymerization of cationic polyacrylamide and at least one of polymers containing carboxyl functional groups or carboxylate functional groups. The polymer binder forms a three-dimensional network structure through in-situ cross-linking in a normal-temperature pulping process, so that the stability of slurry, especially nano slurry, can be improved, the volume change of the electrode is effectively limited, and the stability of the electrode structure is maintained.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery production, and in particular relates to a cross-linked water-based binder for lithium-ion batteries and an electrode prepared therefrom. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, high working voltage, and long cycle life, and have been widely used in portable electronic products, electric vehicles and other fields. The further development of lithium-ion batteries with high energy density puts forward higher requirements for electrode materials. For lithium-ion battery anode materials, graphite-based anode materials are currently the most widely used commercially, but their theoretical specific capacity is only 372mAh / g, which is difficult to meet the needs of further development of lithium-ion batteries. [0003] Silicon material is a type of negative electrode material that has been studied more in recent years. Compared with gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/131H01M4/134H01M4/1391H01M4/1395H01M4/04H01M10/0525
CPCH01M4/0404H01M4/043H01M4/131H01M4/134H01M4/1391H01M4/1395H01M4/622H01M10/0525Y02E60/10
Inventor 杨娟玉张健华王宁方升余章龙史碧梦
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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